Why the woofer moves badly when playing certain LPs
Cleeds, have you actually impulse tested your system and looked at the frequency response curve? Are you using digital room control? Being meticulous with setup is very important and it will certainly help but even if you have your tonearm set at say 12 Hz there is still going to be plenty of rubbish below 10 Hz that is going to get through. With the volume high enough everybody's woofers are going to flap at least a little unless they have a filter and in analog it would have to start rolling off at about 30 Hz. It is true that sealed systems will flap less than ported ones because pressure does not build up within the enclosure. This may well not be a case of rumble in the record as I previously thought but there is certainly an element of record quality here and speaking from personal experience there are many modern pressings with rumble built in. |
mijostyn Are you using digital room control?No. ... even if you have your tonearm set at say 12 Hz there is still going to be plenty of rubbish below 10 Hz that is going to get through.Not so. Not even close. I understand that this will be a problem in many systems, and that a rumble filter may be the only way to fully correct the problem in those cases. But to insist that "plenty of rubbish below 10 Hz" is going to reach the woofers in every system and is an inherent problem in LP playback is simply false. With the volume high enough everybody’s woofers are going to flap at least a little unless they have a filter ...Nope. Not in my system. |
Hello starbusters, That is a classic example of a bad record. If your problem is only with certain new records, and does not happen with old records, then very probably your system is ok. That to me looks like a pressing error of the record. On the video, towards the end, it is obvious that record is warped... Bad production of the record mechanically... Not much that you can do there...Subsonic filter may help, but only to a certain degree... Hope this helps.. |
